Unique design that combines the acoustic response of a traditional bell and diaphragm into a convenient one-sided chestpiece. Bell-type low frequency response is achieved by simply holding the chestpiece in place with light pressure. Firm pressure will produce diaphragm-type frequency performance. A rubber gasket recessed into the chestpiece alters the diaphragm permitting the scope to achieve multi-frequency response. Custom molded extra thick bi-lumen 19″ PVC tubing stays soft and flexible. Extra thick tubing walls minimize extraneous noise. Includes one pair of plastic eartips and two pairs of ADSOFT PVC eartips (small and large). Overall length 27″. Weight 7.15 oz. Scope ID tag included. Lifetime quality performance guarantee. Latex free.